I'm going to ask this question here too..  are we talking about the DNS
or are we talking about an applications use of data published in the DNS?

i see this draft in the context of the historical DNS ... it is a mapping
service,  a name to an address AND an address to a name.  the mapping service
is OPTIONAL ... the Internet does not now (and should NEVER) depend on this
service being available for any other service to work.

I think a key point here is that -reciprocity- is and should be highly valued
feature of DNS provisioning.

that said, if one provisions mapping in one direction, it should also be
provided in the other.  

e.g.  

        label1 == address1  implies   address1 == label1

so, if it is legal to have this construct:

        label == address1
              == address2
              ...
              == addressN

then this construct should also be legal:

        address == name1
                == name2
                ...
                == nameN

what we have is a mess....

        label1 == address1918
        address1918 == lable8

which, while technicallu legal, violates the spirit of the 
lema posited above, as does;

        label35 == address1918
        and address1918 has no matching label.


we now return you to your SMTP coloured discussion.

--bill
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